S&P 500, Dow end lower

The S&P 500 index ended a choppy session marginally lower on Wednesday after Fed meeting minutes showed that a majority of officials judged the efficacy of the central bank’s bond purchases was likely declining over time. The S&P finished down 0.39 point to 1,837.49. The Dow fell 68.20 points, or 0.4%, to 16,462.74.